2006-10-02 00:20:21 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Zoology
It had been thought that the left half of the brain was responsible for language processing in right handed people, while the right hemisphere played the same role for left handed people.
But subsequent research had found that while 95% of right handed people did indeed process language in the left hemisphere, so did 70% of left handed people - and half of the rest used both hemispheres.
Recent researches showed right-handed people use the right hemisphere of their brain to focus on the whole of an image - for example a forest. But when it comes to focusing on the detail within an image - for instance individual trees in a forest - then they use their left hemisphere. For left-handers the opposite is true.
The theory explaining the hand dominancy as being related to the dominant brain hemisphere is recently undergoing further investigations and some researchers are trying to figure out that heredity or genetics got something to justify regarding the explanation of the hand dominancy issue.
2006-10-02 16:56:15 · answer #1 · answered by ♥ lani s 7 · 0⤊ 0⤋
Of course for righties, the dominant right hand is controlled by the left brain that features logic and the left hand is controlled by the right brain that features imagination and space relations. If a righty holds a nail with the right hand and hammers it with his left, he runs the risk that the right hand "knows" it is holding a nail and why but not where the nail should be while the left hand imagines the hammer should strike the nail (or thumbnail?) but doesn't know exactly why to strike the blow. Lefties would have the same problem in reverse. A given hand domintates because logic dominates (in most cases?). Actually, the lens of the human eye inverts up and down as well as right and left. Perhaps one side of the brain is assigned the task of keeping the real world "straight" and that side must dominate for survival.
2006-10-02 08:45:37 · answer #2 · answered by Kes 7 · 0⤊ 0⤋
We don't actually we have a dominant right or left side of the brain which in effect causes a stronger right or left side of our body coordination.
2006-10-02 07:57:11 · answer #3 · answered by kiss 4 · 1⤊ 0⤋
Genetics...some animals have dominant "hands" as well...I believe all polar bears are left "handed"...or more correctly "pawed"
2006-10-02 07:25:12 · answer #4 · answered by Shaun 4 · 1⤊ 1⤋